Math Questions....

[jay47]

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Can someone tell me how to do this....


If a is a positive integer and

15^(a) + 15^(a+1)=?

They have the answer as....16(15^(a)) which is correct, but I don't know how to think about it logically. Thanks.

 

[OneSmileDDS]

Can someone tell me how to do this....


If a is a positive integer and

15^(a) + 15^(a+1)=?

They have the answer as....16(15^(a)) which is correct, but I don't know how to think about it logically. Thanks.

15^(a) + 15^(a+1)= 15^(a) + 15^(a) x 15^(1)= 15^(a)[1 + 15] = 16(15^(a))

 

[jay47]

BTW, to anyone who has taken the DAT, do we need to know trig identities? Thanks

 

[Streetwolf]

You should know the basic ones.

 

[jimmy1fernan]

this people dont let you use a calculater right?

 

[Mstoothlady2012]

this people dont let you use a calculater right?

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